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https://issues.apache.org/jira/browse/YARN-9718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16898220#comment-16898220
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Eric Yang commented on YARN-9718:
---------------------------------
This issue has been classified as an unexpected product behavior but not a
security hole. Open this issue as Jira ticket to track the development
progress.
> Yarn REST API, services endpoint remote command ejection
> --------------------------------------------------------
>
> Key: YARN-9718
> URL: https://issues.apache.org/jira/browse/YARN-9718
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Eric Yang
> Priority: Major
>
> Email from Oskars Vegeris:
>
> During internal infrastructure testing it was discovered that the Hadoop Yarn
> REST endpoint /app/v1/services contains a command injection vulnerability.
>
> The services endpoint's normal use-case is for launching containers (e.g.
> Docker images/apps), however by providing an argument with special shell
> characters it is possible to execute arbitrary commands on the Host server -
> this would allow to escalate privileges and access.
>
> The command injection is possible in the parameter for JVM options -
> "yarn.service.am.java.opts". It's possible to enter arbitrary shell commands
> by using sub-shell syntax `cmd` or $(cmd). No shell character filtering is
> performed.
>
> The "launch_command" which needs to be provided is meant for the container
> and if it's not being run in privileged mode or with special options, host OS
> should not be accessible.
>
> I've attached a minimal request sample with an injected 'ping' command. The
> endpoint can also be found via UI @
> [http://yarn-resource-manager:8088/ui2/#/yarn-services]
>
> If no auth, or "simple auth" (username) is enabled, commands can be executed
> on the host OS. I know commands can also be ran by the "new-application"
> feature, however this is clearly not meant to be a way to touch the host OS.
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